lkml.org 
[lkml]   [2018]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH v2 6/7] x86: BUG() when uaccess helpers fault on kernel addresses
From
There have been multiple kernel vulnerabilities that permitted userspace to
pass completely unchecked pointers through to userspace accessors:

- the waitid() bug - commit 96ca579a1ecc ("waitid(): Add missing
access_ok() checks")
- the sg/bsg read/write APIs
- the infiniband read/write APIs

These don't happen all that often, but when they do happen, it is hard to
test for them properly; and it is probably also hard to discover them with
fuzzing. Even when an unmapped kernel address is supplied to such buggy
code, it just returns -EFAULT instead of doing a proper BUG() or at least
WARN().

This patch attempts to make such misbehaving code a bit more visible by
refusing to do a fixup in the pagefault handler code when a userspace
accessor causes #PF on a kernel address and the current context isn't
whitelisted.

Signed-off-by: Jann Horn <jannh@google.com>
---
arch/x86/mm/extable.c | 58 +++++++++++++++++++++++++++++++++++++++++++
include/linux/sched.h | 6 +++++
mm/maccess.c | 6 +++++
3 files changed, 70 insertions(+)

diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index 4110cca93a08..28298b4e5080 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -112,10 +112,66 @@ __visible bool ex_handler_fprestore(const struct exception_table_entry *fixup,
}
EXPORT_SYMBOL_GPL(ex_handler_fprestore);

+/* Helper to check whether a uaccess fault indicates a kernel bug. */
+static bool bogus_uaccess(struct pt_regs *regs, int trapnr,
+ unsigned long fault_addr)
+{
+ /* This is the normal case: #PF with a fault address in userspace. */
+ if (trapnr == X86_TRAP_PF && fault_addr < TASK_SIZE_MAX)
+ return false;
+
+ /*
+ * This code can be reached for machine checks, but only if the #MC
+ * handler has already decided that it looks like a candidate for fixup.
+ * This e.g. happens when attempting to access userspace memory which
+ * the CPU can't access because of uncorrectable bad memory.
+ */
+ if (trapnr == X86_TRAP_MC)
+ return false;
+
+ /*
+ * There are two remaining exception types we might encounter here:
+ * - #PF for faulting accesses to kernel addresses
+ * - #GP for faulting accesses to noncanonical addresses
+ * Complain about anything else.
+ */
+ if (trapnr != X86_TRAP_PF && trapnr != X86_TRAP_GP) {
+ WARN(1, "unexpected trap %d in uaccess\n", trapnr);
+ return false;
+ }
+
+ /*
+ * This is a faulting memory access in kernel space, on a kernel
+ * address, in a usercopy function. This can e.g. be caused by improper
+ * use of helpers like __put_user and by improper attempts to access
+ * userspace addresses in KERNEL_DS regions.
+ * The one (semi-)legitimate exception are probe_kernel_{read,write}(),
+ * which can be invoked from places like kgdb, /dev/mem (for reading)
+ * and privileged BPF code (for reading).
+ * The probe_kernel_*() functions set the kernel_uaccess_faults_ok flag
+ * to tell us that faulting on kernel addresses, and even noncanonical
+ * addresses, in a userspace accessor does not necessarily imply a
+ * kernel bug, root might just be doing weird stuff.
+ */
+ if (current->kernel_uaccess_faults_ok)
+ return false;
+
+ /* This is bad. Refuse the fixup so that we go into die(). */
+ if (trapnr == X86_TRAP_PF) {
+ pr_emerg("BUG: pagefault on kernel address 0x%lx in non-whitelisted uaccess\n",
+ fault_addr);
+ } else {
+ pr_emerg("BUG: GPF in non-whitelisted uaccess (non-canonical address?)\n");
+ }
+ return true;
+}
+
__visible bool ex_handler_uaccess(const struct exception_table_entry *fixup,
struct pt_regs *regs, int trapnr,
unsigned long fault_addr)
{
+ if (bogus_uaccess(regs, trapnr, fault_addr))
+ return false;
regs->ip = ex_fixup_addr(fixup);
return true;
}
@@ -125,6 +181,8 @@ __visible bool ex_handler_ext(const struct exception_table_entry *fixup,
struct pt_regs *regs, int trapnr,
unsigned long fault_addr)
{
+ if (bogus_uaccess(regs, trapnr, fault_addr))
+ return false;
/* Special hack for uaccess_err */
current->thread.uaccess_err = 1;
regs->ip = ex_fixup_addr(fixup);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 00de3e950dd4..7ea3f4afc0ee 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -739,6 +739,12 @@ struct task_struct {
unsigned use_memdelay:1;
#endif

+ /*
+ * May usercopy functions fault on kernel addresses?
+ * This is not just a single bit because this can potentially nest.
+ */
+ unsigned int kernel_uaccess_faults_ok;
+
unsigned long atomic_flags; /* Flags requiring atomic access. */

struct restart_block restart_block;
diff --git a/mm/maccess.c b/mm/maccess.c
index ec00be51a24f..f3416632e5a4 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -30,8 +30,10 @@ long __probe_kernel_read(void *dst, const void *src, size_t size)

set_fs(KERNEL_DS);
pagefault_disable();
+ current->kernel_uaccess_faults_ok++;
ret = __copy_from_user_inatomic(dst,
(__force const void __user *)src, size);
+ current->kernel_uaccess_faults_ok--;
pagefault_enable();
set_fs(old_fs);

@@ -58,7 +60,9 @@ long __probe_kernel_write(void *dst, const void *src, size_t size)

set_fs(KERNEL_DS);
pagefault_disable();
+ current->kernel_uaccess_faults_ok++;
ret = __copy_to_user_inatomic((__force void __user *)dst, src, size);
+ current->kernel_uaccess_faults_ok--;
pagefault_enable();
set_fs(old_fs);

@@ -94,11 +98,13 @@ long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)

set_fs(KERNEL_DS);
pagefault_disable();
+ current->kernel_uaccess_faults_ok++;

do {
ret = __get_user(*dst++, (const char __user __force *)src++);
} while (dst[-1] && ret == 0 && src - unsafe_addr < count);

+ current->kernel_uaccess_faults_ok--;
dst[-1] = '\0';
pagefault_enable();
set_fs(old_fs);
--
2.19.0.rc0.228.g281dcd1b4d0-goog
\
 
 \ /
  Last update: 2018-08-27 20:58    [W:0.085 / U:9.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site